My take on this is that people assume that bio products have fabric conditioners in them and therefore should not be used for washing microfibre towels as the performance will degrade. I contacted Persil to ask them if their biological products contained fabric conditioners - the answer is no.
It seems as though biological products are better at removing stains than non bio products. Are there any chemists in the audience?

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Non Biological means it doesn’t contain enzymes, so the cleaning chemicals need to be harsher and usually rely on hot water. Biological cleaners can be used effectively at lower temperature and still be effective

Biological detergents clean in the same way as non-biological ones with additional effects from the enzymes, whose purpose is to break down protein, starches and fat in dirt and stains on clothing to be laundered, for example food stains, sweat and mud

Different enzymes are suitable for different applications and fabrics. Lipase enzyme for example being more suitable as a degreaser, and others more general purpose or for removing particular dirt types such as the effect protease has on the protein molecules in food stuffs.

I'm a Chemical Engineer not a Chemist so I'm unable to provide much more information other than basics